Trimming (computer programming)

In computer programming, trimming (trim) or stripping (strip) is a string manipulation in which leading and trailing whitespace is removed from a string.

For example, the string (enclosed by apostrophes)

would be changed, after trimming, to

Variants

Definition of whitespace

The characters which are considered whitespace varies between programming languages and implementations. For example, C traditionally only counts space, tab, line feed, and carriage return characters, while languages which support Unicode typically include all Unicode space characters. Some implementations also include ASCII control codes (non-printing characters) along with whitespace characters.

Java's trim method considers ASCII spaces and control codes as whitespace, contrasting with the Java isWhitespace() method, which recognizes all Unicode space characters.

Delphi's Trim function considers characters U+0000 (NULL) through U+0020 (SPACE) to be whitespace.

Usage

Following are examples of trimming a string using several programming languages. All of the implementations shown return a new string and do not alter the original variable.

Trim (computing)

A Trim command (known as TRIM in the ATA command set, and UNMAP in the SCSI command set) allows an operating system to inform a solid-state drive (SSD) which blocks of data are no longer considered in use and can be wiped internally.

Trim was introduced soon after SSDs were introduced. Because low-level operation of SSDs differs significantly from hard drives, the typical way in which operating systems handle operations like deletes and formats resulted in unanticipated progressive performance degradation of write operations on SSDs. Trimming enables the SSD to handle garbage collection overhead, which would otherwise significantly slow down future write operations to the involved blocks, in advance.

Although tools to "reset" some drives to a fresh state were already available before the introduction of trimming, they also delete all data on the drive, which makes them impractical to use for ongoing optimization. By 2014 many SSDs had internal idle/background garbage collection mechanisms that work independently of trimming; although this successfully maintains their performance even under operating systems that do not support Trim, it has the associated drawbacks of increased write amplification and wear of the flash cells.

Draft (hull)

The draft (American) or draught (British) of a ship's hull is the vertical distance between the waterline and the bottom of the hull (keel), with the thickness of the hull included; in the case of not being included the draft outline would be obtained. Draft determines the minimum depth of water a ship or boat can safely navigate. The draft can also be used to determine the weight of the cargo on board by calculating the total displacement of water and then using Archimedes' principle. A table made by the shipyard shows the water displacement for each draft. The density of the water (salt or fresh) and the content of the ship's bunkers has to be taken into account. The closely related term "trim" is defined as the difference between the forward and aft drafts.

Drafts of a ship

Hangman

Hangman may refer to:

Common meanings

Arts and entertainment

Michael Slade

Michael Slade (born 1947, Lethbridge, Alberta) is the pen name of Canadian novelist Jay Clarke, a lawyer who has participated in more than 100 criminal cases and who specializes in criminal insanity. Before Clarke entered law school, his undergraduate studies focused on history. Clarke’s writing stems from his experience as a practicing lawyer and historian, as well as his extensive world travel. He works closely with police officers to ensure that his novels incorporate state-of-the-art police techniques. Writing as a team with a handful of other authors, Clarke has published a series of police procedurals about the fictional Special External Section (Special X) of the Royal Canadian Mounted Police. His novels describe Special X protagonists as they track down fugitives, typically deranged murderers. Four other authors have contributed under the name Michael Slade: John Banks, Lee Clarke, Rebecca Clarke, and Richard Covell. Despite the collaborative nature of the books, Jay Clarke is the predominant voice in their writing. Currently, Jay and his daughter Rebecca write under the Slade name.

Hangman (game)

Hangman is a paper and pencil guessing game for two or more players. One player thinks of a word, phrase or sentence and the other tries to guess it by suggesting letters or numbers, within a certain number of guesses.

Overview

The word to guess is represented by a row of dashes, representing each letter of the word. Words you cannot use include proper nouns such as names, places, and brands. If the guessing player suggests a letter which occurs in the word, the other player writes it in all its correct positions. If the suggested letter or number does not occur in the word, the other player draws one element of a hanged man stick figure as a tally mark. The game is over when:

This diagram is, in fact, designed to look like a hanging man. Although debates have arisen about the questionable taste of this picture, it is still in use today. A common alternative for teachers is to draw an apple tree with ten apples, erasing or crossing out the apples as the guesses are used up.